[magick-users] Problems with compression in 6.4.2 Q16 (Debian)?

[Leigh Ahwai]

Thanks for the reply.  Seems we're using the same libtiff version.

lahwai at lnx-qa2:/mnt/nfs/krypton/md0/home/lahwai$ identify -list format
...
     TIFF* TIFF      rw+   Tagged Image File Format (LIBTIFF, Version
3.8.2)
   TIFF64* TIFF      ---   Tagged Image File Format (64-bit) (LIBTIFF,
Version 3.8.2)
     ...

lahwai at lnx-qa2:/mnt/nfs/krypton/md0/home/lahwai$ convert logo: -compress
jpeg logo.tif
lahwai at lnx-qa2:/mnt/nfs/krypton/md0/home/lahwai$ tiffinfo logo.tif 
TIFF Directory at offset 0x4b008 (307208)
  ...
  Compression Scheme: None  <-------- FAILED
  ...
  DocumentName: logo.tif
  Software: ImageMagick 6.4.2 07/17/08 Q16 http://www.imagemagick.org

Don't know if this helps, but on our systems that haven't been upgraded
yet (ie are still on IM 6.2.4 with compression working), I notice that
identify gives the following instead:
     TIF*  TIFF      rw+   Tagged Image File Format (42)
     TIFF* TIFF      rw+   Tagged Image File Format (42)

Appreciating the attempts to help resolve...

Cheers,
Leigh Ahwai

Manager, Development

 

Ext: 4037

 

 

3685 Richmond Road, Suite 500
Ottawa,  ON,  Canada  K2H 5B7
t: 613.829.0414  f: 613.829.0515  
www.chipworks.com 

-----Original Message-----
From: duc.sequere.aut.de.via.decede at imagemagick.org
[mailto:duc.sequere.aut.de.via.decede at imagemagick.org] 
Sent: Thursday, July 17, 2008 6:23 PM
To: Leigh Ahwai; magick-users at imagemagick.org
Subject: Re: [magick-users] Problems with compression in 6.4.2 Q16
(Debian)?

> Has compression been broken?

Works for us:

  convert logo: -compress jpeg logo.tif
  tiffinfo logo.tif
    ...
  Compression Scheme: JPEG

Type 

  identify -list format

which version of TIFF are you using?  We get

  TIFF* TIFF      rw+   Tagged Image File Format (LIBTIFF, Version
3.8.2)

Its possible your version of TIFF does not have JPEG compression
enabled.
ImageMagick checks to see if the compression is supported.  If its not,
it resets it to 'none'.
This e-mail message may contain client privileged and/or confidential information, and is intended only for the use of the individual or entity named above. Any unauthorized use, dissemination or copying is strictly prohibited.  If you have received this communication in error, please notify us immediately by reply e-mail and delete or discard this message. Thank you.